To what extent is the Whitepaper crucial for an ICO to be successful ?

Hi all,

I am not an investor just a student working on ICO best practices and especially ICOs' related documentation best practices.
Though I know that any serious ICO investor considers WP as a reference document before investing and an element of discussions on forums, I would like to try to evaluate the influence of the quality of a WP on the success of an ICO.

I read a lot about WP best practices in articles (length, style, content ...) but I do not really think it exists a clear correlation between WP quality and ICO success. What do you think ? You would invest in a project with good technology/team/token and WP, but would you do it if the project is good but WP is very poor ? If so, where would you gather additional information ? For you, what is the impact of the WP on your investment decision ?

More largely, how would you do to evaluate the influence of the WP on ICO success/failure ?

Thank you for your help !